RIVERDALE fans are still trying to solve the mystery of the Black Hood's identity, and a new theory believes it could be Betty Cooper terrorising the town.

WARNING: This article contains spoilers about Riverdale season two, episodes five and six.

The sinister killer took their relationship with Betty (played by Lili Reinhart) to the next level in last week's episode, after it was revealed their their spree of violent crime was inspired by her.

The anonymous murderer blackmailed her into ending her relationship with Jughead (Cole Sprouse) and cutting ties with those close to her, before demanding that she give them the name of someone to attack after threatening to attack her pregnant sister if she didn't.

A new theory claims that a "dark Betty" could in fact be the killer, pointing to hints that she suffers from a kind of dissociative identity disorder.

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Riverdale fans have theorised that Betty Cooper could be the Black Hood

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Betty and Chic Cooper could be sharing the role of the mysterious killer

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Reddit user dahuterschuter stated that the killer is both the "dark" side of Betty and her long-lost brother Chic Cooper (Hart Denton).

The theory could explain the Black Hood's obsession with Betty, as Chic finds solace in her after being given up for adoption by their mother, Alice Cooper (Mädchen Amick), and feeling victimised by the corruption of the North Side.

The social media user explained that Betty would have known the identity of her tormentor, however, theorising: "Dark Betty knows all of the otherwise unknowable information about Betty's actions and Riverdale gossip, she can write cryptic notes to Betty that only Betty would know the answer to, she can leave herself messages and calls through a voice changer even down to predicting conversations with herself."